Hello there, I just wanted to try out some RDF* and SPARQL* examples with arq and did not get the expected result. Actually I get no result at all.
I tried with the examples listed here: https://jena.apache.org/documentation/rdfstar/ My data.ttl file contains ```turtle @prefix dct: <http://purl.org/dc/terms/> . @prefix foaf: <http://xmlns.com/foaf/0.1/> . @prefix : <http://example.org/> . << :john foaf:name "John Smith" >> dct:source <http://example/directory> . ``` My query.rq file contains: ```sparql prefix dct: <http://purl.org/dc/terms/> prefix foaf: <http://xmlns.com/foaf/0.1/> prefix : <http://example.org> SELECT ?name { <<:john foaf:name ?name >> dct:source <http://example/directory> } ``` I query with the following command: `arq —query=query.rq —data=data.ttl --results=json` My result looks like this: ```json { "head": { "vars": [ "name" ] } , "results": { "bindings": [ ] } } ``` A simple s-p-o query returns this, which made me feel like RDF* is generally supported by arq: ```json { "head": { "vars": [ "s" , "p" , "o" ] } , "results": { "bindings": [ { "s": { "type": "triple" , "value": { "subject": { "type": "uri" , "value": "http://example.org/john"; } , "property": { "type": "uri" , "value": "http://xmlns.com/foaf/0.1/name"; } , "object": { "type": "literal" , "value": "John Smith" } } } , "p": { "type": "uri" , "value": "http://purl.org/dc/terms/source"; } , "o": { "type": "uri" , "value": "http://example/directory"; } } ] } } ``` So I guess my SPARQL* query approach is somehow wrong, but I just can’t figure out. Do you have an idea? Thank you! Steffen
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